Richard w



(No Model.)

R. W. BLAGKMORE. ELECTRICAL TRANSFORMER PLATE.

Patented Apr. 6, 1897.

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IIVVEIVTOR RZ c'AaraZ W3 hchnara By (CM [J UNITED STATES PATENT OFFICE.

RICHARD W. BLAOKMORE, OF PEORIA, ILLINOIS, ASSIGNOR TO THE ROYAL ELECTRIC COMPANY, OF SAME PLACE.

ELECTRECAL. TRANSFORM El i-PLATE.

SPECIFICATION forming part of Letters Patent No. 580,206, dated April 6, 1897. Application filed November 20,1896- Serial No. 612,534- (No model.)

To all whom it may concern.- view of the same plate, only that a certain Be it known that I, RICHARD W. BLACK- portion of it is represented as bent upward, MORE, a citizen of the United States, and a leaving the two holes entirely open for reresidentof Peoria, countyof Peoria, and State ceiving the coil. Fig. is a top view of the 5. of Illinois, have invented anew and usefulImpreferred manner in which I build up my provement in Electrical Transformer-Plates, transformer without the use of bolts and nuts. of which the following is a specification. The transformer-plate is numbered 1, and

lleretofore it has been common to construct the flexible side piece adapted to be bent backthe core of an electric transformer from thin ward and forward is numbered 2. This is 1o flexible sheets of soft iron or steel superposed formed in the following manner: The plate upon one another and preferably respectively 1 has in the first place two holes 3 and is proinsulatcd each. from its neighbor in any suit vided with a out -i from one hole to the outable manner. The plates in said transformside edge of the plate and with another cut ers have openings for receiving different sides 5 from one hole to the other. This leaves of the coils of wire forming the primary and the side piece 2 adapted to be bent upward secondary conductors. For the purpose of at the dotted line (3. In Fig. 3 the side piece introducing the coil, which necessarily has a 2 and the rest of the plate 1 are in the same closed contour, it has been proposed to cut plane, while in Fig. 4t the side piece 2 is bent the core-plates from each hole to the outside upward, leaving the holes 3 accessible for the 2o edge, so that the middle tongue thereby introduction of the sides of the coil, which formed may be bent backward and forward is numbered 7 in such a manner that during the construc- In building the whole core it is preferable tion of the transformer said core-plates could to so aggregate the laminze that the side piece be placed one above the other until the whole 2 is alternately in the same position rela- 2 5 core was constructed. tively to the coil. This is illustrated in the I have experienced difficulty, not in the apview shown in Fig. 2, where the ends of the plication of theprinciple underlying such conside piece 2 appear only in alternate layers. struction, but in the practical carrying out The slots of the intermediate plates are of the same, and I have devised a form in located diametrically opposite, behind the 0 which much valuable time may be saved in coil '7.

the construction, and at the same time my Fig. 5 shows the preferred mechanical concore-plate is different from those heretofore struction of the converter involving means applied. for holding the transformer-plates to one an- Briefiy stated, the invention consists of a other and to the coil, and it consists of wedges 8 5 5 core plate for an electrical transformer 11, driven into the spaces 12, Fig. 1, remainstamped from a sheet of softiron or steel into ing between the curved portions of the coil a rectangular form and so that there are two and the opposite sides of the group of plates 1. rectangular holes. Extending from one hole In this case the holes 8 may be omitted and to the outside edge there is a cut. The mathe corners of the plates at 13 may be cut off, 4o terial is also cut through from one hole to as indicated. In this manner a compact conthe other, and these two cuts are made along verter is produced without the aid of methe line coinciding with the corresponding chanical clamps orbolts,and the transformeredges of the two holes. plates are at the same time held together with In order to set forth the exact nature of the greatest rigidity. As pointed out in re- 5 the invention as to all its details, I have angard to Fig. 2, the electric plates should be nexed drawings, in whicharranged differently. The cut 4 is on one Figure 1 is a front elevation of the transpart of the converter, as shown in Fig. 5 in former. Fig. 2 is a side elevation of that the top plate, while the corresponding cut a which is shown in Fig. 1. Fig. 3 is plan of in the next plate is at the opposite part of 50 one of the plates of the transformer, all of the converter below the top plate, and so on them being substantially alike. Fig. t is a alternately, as explained in reference to Fig.2.

The operation is Very simple. As usual, the coil is first wound upon a frame, so that it will have rigidity and be ready for applying the core. Then each plate 1 is taken and the side piece 2 bent upward and the plates so applied, successively, that the sides of the coil 7 will enter the holes As soon as each plate is in place the side piece 2 is bent down fiat again, and the next plate is applied, and so on until finally the core is built to sufficient thickness, when the bolts 8, suitably insulated, are passed through the holes 9 and are clamped together by nuts 10.

I claim as my invention- An electrical transformer-plate, havin g two 

